668117786 has 16 divisors (see below), whose sum is σ = 1205626560. Its totient is φ = 271265760.

The previous prime is 668117783. The next prime is 668117887. The reversal of 668117786 is 687711866.

It is not an unprimeable number, because it can be changed into a prime (668117783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1255595 + ... + 1256126.

It is an arithmetic number, because the mean of its divisors is an integer number (75351660).

Almost surely, 2^668117786 is an apocalyptic number.

668117786 is a deficient number, since it is larger than the sum of its proper divisors (537508774).

668117786 is a wasteful number, since it uses less digits than its factorization.

668117786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2511749.

The product of its digits is 677376, while the sum is 50.

The square root of 668117786 is about 25847.9745047847. The cubic root of 668117786 is about 874.2138401575.

The spelling of 668117786 in words is "six hundred sixty-eight million, one hundred seventeen thousand, seven hundred eighty-six".